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Volume 1996 (1996)
- Issue 175 Pages 243-
- Issue 174 Pages 195-
- Issue 173 Pages 137-
- Issue 172 Pages 71-
- Issue 171 Pages 2-
Volume 1996, Issue 174
Displaying 1-8 of 8 articles from this issue
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Tsuyoshi Nakajima, Katsunori Yanagida1996 Volume 1996 Issue 174 Pages 195-200
Published: September 30, 1996
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThe effect of surface modification of carbon materials on their electrochemical behavior has been studied. Fluorination, ozonization and air-oxidation of carbon surfaces increased the charge-discharge capacities. The change in the d-spacings of carbon materials due to surface modification was negligibly small. XPS measurement indicated that surface oxygen contents slightly increased not only in oxidized samples but also in fluorinated one. XPS also revealed the existence of nearly ionic and semi-covalent fluorines at the surface of the fluorinated sample.View full abstractDownload PDF (644K) -
Hisashi Kajiura, Yasuhiro Tanabe, Masaya Kodama, Eiichi Yasuda1996 Volume 1996 Issue 174 Pages 201-203
Published: September 30, 1996
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSUltra-fine particles (UFP) were prepared from coal tar pitch (CTP) and A240 pitch by anti-solvent procedures using quinoline and acetone as a rich and a poor solvents, respectively. The size of the obtained UFP depended upon the pitch/quinoline ratio and starting materials. The UFP with about 50nm in diameter could be obtained from CTP under an appropriate condition. The UFPs were treated with iodine at 90°C for stabilization, followed by a carbonization process at 800°C for 1hour with the heating rate of 2.5°C/min in Ar flow. A suitable iodine treatment was effective to preserve the shape of UFP after carbonization. The carbon yield of the UFP increased by the iodine treatment. Therefore, it was clarified that the UFP was able to be stabilized by the iodine treatment.View full abstractDownload PDF (2961K) -
Masaya Kodama, Hidemasa Honda1996 Volume 1996 Issue 174 Pages 204-206
Published: September 30, 1996
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSIn order to simply prepare metal dispersed activated carbon, a soluble anisotropic pitch containing 1Owt% of platinum acetylacetonate complex as a precursor for metal particles was heat-treated in the presence of a large excess of potassium hydroxide (KOH). The heat treatment with KOH at 700-900°C enabled us to obtain highly activated carbon having more than 2000m2/g of BET specific surface area. The platinum particles pyrolytically appeared from the complex finely dispersed in activated carbon matrix. Besides their particle size was less than 1Onm in diameter, which means that the particles somewhat aggregated compared with those obtained after regular heat treatment without KOH at the corresponding temperature. To prevent the particles from aggregation, rapidly heating such as 50°C/min was effective, thereby, the particle size was able to controlled less than 3nm in diameter.View full abstractDownload PDF (1791K) -
Ko Sugihara1996 Volume 1996 Issue 174 Pages 207-214
Published: September 30, 1996
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSThis article reviews the physics of the lattice vibration and electron-phonon interaction in graphite, mainly focusing on the side view of phonons. The subjects treated here are as follows: (i) the lattice dynamics and specific heat theory by Komatsu-Nagamiya and subsequent studies, (ii) the role of the shear strain constant C44 on the low temperature anomalous specific heat in soft carbons and (iii) a- and c- axes phonon-drag thermoelectric power due to the out-of-plane vibration.View full abstractDownload PDF (961K) -
Seiji Motojima, Hiroshi Iwanaga1996 Volume 1996 Issue 174 Pages 215-224
Published: September 30, 1996
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSMicro-coiled carbon fibers (coils) were prepared by catalytic pyrolysis of acetylene at 650-850°C, and growth conditions, morphology, growth mechanism and some properties were examined. The key points for obtaining coils with high coil yield were strict control of (1) kind of catalyst, (2) kind and flow rate of impurity gas, (3) reaction temperature, and (4) separation between source gas inlet and substrate. The most effective catalysts were Ni, Ti, and W. The coils show an excellent electromagnetic shielding effect. TiC coils were obtained by vapor phase titanizing of the coils.View full abstractDownload PDF (2131K) -
Osamu Ito1996 Volume 1996 Issue 174 Pages 225-233
Published: September 30, 1996
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSPhotochemical properties of fullerenes such as C60 and C70 have been widely studied on the view points of fundamental scientific and technological interests. Photo-illumination of fullerenes leads to their excited states, which have different character from that of the ground state. For example, an increase in the photoinduced electric conductivity of polymers was found by doping them with C60 and C70. Fullerenes such as C60 and C70 easily show photoinduced charge separation on the addition of appropriate electron donors or acceptors in their excited states. Mechanism of electron transfer varies with the conditions such as reaction media, concentration and donor ability. For the modification of the fullerenes, photochemistry is also useful. When electron donors are bonded with fullerenes, electron transfer takes place efficiently. Chemical modification also develops potential uses of fullerenes as new materials.View full abstractDownload PDF (1294K) -
[in Japanese]1996 Volume 1996 Issue 174 Pages 234
Published: September 30, 1996
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (240K) -
[in Japanese]1996 Volume 1996 Issue 174 Pages 236
Published: September 30, 1996
Released on J-STAGE: June 28, 2010
JOURNAL FREE ACCESSDownload PDF (168K)
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